Physics
To prevent damage from lightning, lightning conductors are used on tall structures. The lightning conductor

Can be of any shape
Should be made of a good conductor but can be of any shape
Should be made of a good conductor like copper with sharp-pointed edges
Should be in the form of a vertical rod

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Physics
A dynamo is used to convert

Electrical energy into magnetic energy
Magnetic energy into mechanical energy
Mechanical energy into electrical energy
Electrical energy into mechanical energy

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